| nonstop(adjective, adverb, direct, continue, steady) |
| recurrent(adjective, continuous, continual) |
| regular(verb, adjective, sound, steady, persistent) |
| repetitive(adjective, continuous, continual) |
| indefatigable(adjective, strong, firm, determined, steady) |
| permanent(adjective, steady, stable, persistent, constant) |
| repeated(adjective, continuous, continual) |
| unchanging(adjective, steady, persistent, constant, continuous) |
| unfailing(adjective, strong, continue, firm, determined) |
| unvarying(adjective, steady, regular, persistent, even) |
| perennial(adjective, constant, continuous, lasting, permanent) |
| connected(adjective, steady, persistent, constant, continuous) |
| continued(adjective, strong, firm, determined, steady) |
| lasting(adjective, persistent, constant, living, continuous) |
| round-the-clock(adjective, continue, continual) |
| running(adjective, continual) |
| unflagging(adjective, strong, firm, energetic, determined) |
| consecutive(adjective, steady, constant, continuous, continual) |
| invariable(adjective, persistent, continuous, endless, relentless) |
| monotonous(adjective, persistent, constant, continuous, endless) |